linux-kernel - Re: [PATCH] metag: Only define atomic_dec_if

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Date:   Fri, 7 Oct 2016 21:31:54 +0100
From:   James Hogan <james.hogan@...tec.com>
To:     Guenter Roeck <linux@...ck-us.net>
CC:     <linux-metag@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] metag: Only define atomic_dec_if_positive conditionally

On Fri, Oct 07, 2016 at 10:40:59AM -0700, Guenter Roeck wrote:
> The definition of atomic_dec_if_positive() assumes that
> atomic_sub_if_positive() exists, which is only the case if
> metag specific atomics are used. This results in the following
> build error when trying to build metag1_defconfig.
> 
> kernel/ucount.c: In function 'dec_ucount':
> kernel/ucount.c:211: error:
> 	implicit declaration of function 'atomic_sub_if_positive'
> 
> Moving the definition of atomic_dec_if_positive() into the metag
> conditional code fixes the problem.
> 
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
>  arch/metag/include/asm/atomic.h | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/arch/metag/include/asm/atomic.h b/arch/metag/include/asm/atomic.h
> index 470e365f04ea..8ff0a70865f6 100644
> --- a/arch/metag/include/asm/atomic.h
> +++ b/arch/metag/include/asm/atomic.h
> @@ -39,11 +39,10 @@
>  #define atomic_dec(v) atomic_sub(1, (v))
>  
>  #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
> +#define atomic_dec_if_positive(v)       atomic_sub_if_positive(1, v)
>  
>  #endif
>  
> -#define atomic_dec_if_positive(v)       atomic_sub_if_positive(1, v)
> -
>  #include <asm-generic/atomic64.h>
>  
>  #endif /* __ASM_METAG_ATOMIC_H */

Applied, thanks Guenter!

Cheers
James


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